A navigation system for a vehicle has an evaluation unit for capturing and conditioning vehicle data and/or topographical data. A transmission unit is coupled to the evaluation unit for sending the data captured by the evaluation unit or derived therefrom to navigation systems in other vehicles. A reception unit receives vehicle data and/or topographical data or data derived therefrom from navigation systems in other vehicles. A processing unit is coupled to the reception unit for logically combining and conditioning the data provided by the navigation systems in other vehicles. An output unit outputs the logically combined and conditioned data. The evaluation unit assigns a respective covered path range a numerical value which represents current traffic conditions over this path range, wherein a positive numerical value corresponds to a section on which driving is easy and a negative numerical value signifies poor traffic conditions.